You may well find you need most of what's there, if the ECU is coded to the key you can hide the key behind the steering column cowl and it should bypass the immobiliser for you.
Yours is a later one with electronic parking brake then? There must be some connection from that to the ECU so it releases when you apply throttle (i'm guessing it's auto?) so that you can drive off.
I hope the garages diagnostic process is correct, at least you'll have a spare set of ECUs/modules etc if not.